#include <stdio.h>

int main(){
    unsigned short int a,b,res=2;
    printf("enter 2 number:\n");
    res=scanf("%hu %hu",&a,&b);
    if (res!=2||a>=65536||b>=65536){printf("wrong!please enter unsigned short int\n");}
    if (res==2){
    printf("c*d=%llu\n",(unsigned long long)a*b);}
    return 0;}